Ontario Mark 3 Model O Navy Dive Knife This knife is used exclusively by U.S. Naval Forces. Ontario Knife Company has produced the this knife for many decades and it has seen combat with U.S. armed forces. Needless to say, these veteran blades are not in the business of giving quarter.FEATURES AND SPECIFICATIONS:--BLADE COLOR: Black--BLADE FINISH: Black Oxide--BLADE GRIND: Flat Bevel w/ Secondary Flat Bevel--BLADE LENGTH: 6.0 in (15.2 cm)--BLADE MATERIAL: Stainless Steel--BLADE THICKNESS: 0.165 in (0.419 cm)--EDGE TYPE: Plain--HANDLE COLOR: Black--BLADE HARDNESS: 49-54 HRC--NATIONAL STOCK NUMBER: 1095-00-391-1056--OVERALL LENGTH: 11.1 in (28.2 cm)s--SHEATH: Black Molded Plastic--SHEATH TYPE: Belt Clip--Weight: 1.2 (Lbs)--UPC: 071721-0-6141-0 Made in the USA